0

我正在点击此链接以查找句子级别bleu score

NLTK：语料库级别的 BLEU 与句子级别的 BLEU 分数

当我运行这个例子时：

import nltk
hypothesis = ['This', 'is', 'cat'] 
reference = ['This', 'is', 'a', 'cat']
references = [reference]
nltk.translate.bleu_score.sentence_bleu(references, hypothesis)

输出：

8.987727354491445e-155

输出是0

警告：

/home/mac/.local/lib/python3.6/site-packages/nltk/translate/bleu_score.py:516: UserWarning: 
The hypothesis contains 0 counts of 3-gram overlaps.
Therefore the BLEU score evaluates to 0, independently of
how many N-gram overlaps of lower order it contains.
Consider using lower n-gram order or use SmoothingFunction()
  warnings.warn(_msg)
/home/mac/.local/lib/python3.6/site-packages/nltk/translate/bleu_score.py:516: UserWarning: 
The hypothesis contains 0 counts of 4-gram overlaps.
Therefore the BLEU score evaluates to 0, independently of
how many N-gram overlaps of lower order it contains.
Consider using lower n-gram order or use SmoothingFunction()
  warnings.warn(_msg)

如何为具有 的句子运行相同的功能n-gram for n<4？

还有我可以在里面传递什么参数nltk.translate.bleu_score.sentence_bleu()？

4

0 回答 0